Method and device for detecting an amount of gas in a calibration-capable manner

Abstract

The invention relates to a method and to a device for determining an amount of gaseous fuel, which during a refueling process at a gas station has been transferred into a storage tank via a gas pump ( 3 ) and a filling hose ( 4 ) connected thereto, wherein in the gas pump ( 3 ) of the gas station, a flow meter (F) is provided, which during the filling of the storage tank detects the amount of fuel dispensed. Once the filling is completed, the filling hose ( 4 ) is depressurized, and the amount of fuel, which has not been transferred into the storage tank due to the depressurization, is detected, and this amount is subtracted from the amount detected by the flow meter (F).

1 . A method for determining an amount of gaseous fuel, which during a refueling process at a filling station has been transferred into a storage tank by means of a fuel dispenser ( 3 ) and a filling hose ( 4 ) connected thereto, wherein
 a flow meter (F) is provided in the fuel dispenser ( 3 ) of the filling station and determines the amount of fuel dispensed during the filling of the storage tank, and wherein   the filling hose ( 4 ) is depressurized once the filling process is completed,   characterized in that   the amount of fuel, which has not been transferred into the storage tank due to the depressurization, is determined and this amount is subtracted from the amount determined by the flow meter (F).   
     
     
         2 . The method according to  claim 1 , characterized in that the amount of fuel in the filling hose ( 4 ), which has not been transferred into the storage tank, is determined in that
 a temperature value (T) and a pressure (p) in the filling hose ( 4 ) are respectively determined after the completion of the refueling process and prior to the depressurization in order to determine a density (p) of the fuel in the filling hose ( 4 ), in that   the volume (V) of the filling hose ( 4 ) is known, and in that   the dispensed amount (M) of fuel, which has remained in the filling hose ( 4 ) after the completion of the refueling process, is thereby determined.   
     
     
         3 . The method according to  claim 1 , characterized in that the amount of fuel in the filling hose ( 4 ), which has not been transferred into the storage tank, is determined in that
 a temperature value (T) in the filling hose ( 4 ) is determined after the completion of the refueling process and prior to the depressurization and a pre-adjusted pressure value is used for determining a density (p) of the fuel in the filling hose ( 4 ),   in that the volume (V) of the filling hose ( 4 ) is known, and in that   the dispensed amount (M) of fuel, which has remained in the filling hose ( 4 ) after the completion of the refueling process, is thereby determined.   
     
     
         4 . The method according to  claim 1 , characterized in that the amount of fuel in the filling hose ( 4 ), which has not been transferred into the storage tank, is determined in that
 a pressure value (D) in the filling hose ( 4 ) is determined after the completion of the refueling process and prior to the depressurization and a pre-adjusted temperature value (T) is used for determining a density (p) of the fuel in the filling hose ( 4 ), in that   the volume (V) of the filling hose ( 4 ) is known, and in that   the dispensed amount (M) of fuel, which has remained in the filling hose ( 4 ) after the completion of the refueling process, is thereby determined.   
     
     
         5 . The method according to  claim 1 , characterized in that the gaseous fuel is preferably hydrogen. 
     
     
         6 . The method according to  claim 1 , characterized in that the flow meter (F) is a Coriolis flow meter or a differential pressure flow meter. 
     
     
         7 . The method according to  claim 1 , characterized in that the pressure in the filling hose ( 4 ) lies between 0 and 710 bar, particularly between 350 and 700 bar, during the refueling process. 
     
     
         8 . The method according to  claim 1 , characterized in that the pressure in the filling hose ( 4 ) lies between 0 and 2 bar after the depressurization. 
     
     
         9 . A device for determining an amount of gaseous fuel dispensed during a refueling process at a filling station, which is installed in a fuel dispenser ( 3 ) and connected to a filling hose ( 4 ), characterized in that the device comprises a flow meter (F), to which the filling hose ( 4 ) is connected, and in that a pipeline with an expansion valve ( 6 ) branches off the filling hose ( 4 ). 
     
     
         10 . The device according to  claim 9 , characterized in that sensors for pressure and temperature measurements are provided in or on the filling hose.